The six isomeric trideuteriopyridines and the three isomeric tetradeuteriopyridines undergo phototransposition upon S0 → S2 (π, π*) excitation in the vapor phase at 254 nm. On the basis of the products formed, the six trideuteriopyridine isomers can be divided into two triads. Similarly, the three isomeric tetradeuteriopyridines also constitute a triad. Irradiation of any one member of each triad results
在254 nm的气相中,S 0 →S 2(π,π*)激发后,六个异构的三
氘吡啶和三个异构的四
吡啶吡啶发生光子转移。根据形成的产物,可以将六个
氘代
氘代吡啶的异构体分为两个三联体。同样,三个异构的四
氘代吡啶也构成一个三联体。照射每个三合会的任何一个成员会导致形成该三合会的其他两个成员。这些异构化与涉及光环化,氮在
环戊烯基环的五个侧面周围迁移以及重新麦芽化的机理一致。